Double-moting suction-type brushless linter gin



Sept. 27, 1955 T. P. WALLACE 2,718,669

DOUBLE-MOTING sUcTIoN-TYPE BRUsHLEss LINTER GIN Filed May 16, 1952 we/Za' Thom E Mme United States Patent DOUBLE-MOTIN G 'SUCTIONLTYPE BRUSHLESS LINTERv GIN Thnmas:1.;.Wallace, Memphis,'l7enn-., assigner to The Murray Company of,y Texas,lnc., Dallas,'E,eX-.,i afcorf MlationofDelaware `This invention` relates ton linten gins. of. the so-called blzuahless1 orfsuctionl-type, ani exampleofwhich istillus* trated'imthepatent. to .Graebe No.Y 2,438,047 dated March 16l 19.48, wherein...provision is, made for. overhead mota ing as well, asfor meting below. the saw cylinder., Inv the, gin disclosed. in the: above. patent^ the` initial-,meting takesplaceat a point. to the rearrof, thesaw cylinder. and approximately inthe.horizontalfplane of the axst. of the saw cylinder, theheavy motes, and some-.useful'lint-lbeing expelledV centrifugally into; an overhead motefreceiving clla'rbler` from, which, the motes f, are7 removed in any.. aps propriate way., The. interior, of the gin is at. subatrnosplieric pressure andY a; large. percentage of, the air, current which flows from the, ginenters througlithe; overhead motereceiving chamberN andlin approaching ,the saw^ cylinder carries with it any usefulflintwhich has entered,4 the mote-receiving-l chamber. Tthis'air, with entrained. lint, islcarried,- along: between the, periphery ofthe saw: cylinf der, and an arcuate guardconcentric with the, latter. The usefullint which is pickedup by this air currenttogether with'that which is carriedalonglby-the saw teeth, is diss charged radially from. the, saw cylinder into a ,deliveryF throat'leading down from the lower part of'thesaw cyl?, inder into an underneath motn-g chamber from'lwhich theuseful`l lint is carried.L by the air current into the der. livery ue.

Ih thegin hereinl chosen forlillustration of' the. present invention; the underneathmoting chamber has a concave floor along which the air current sweeps, the motesliug# ging the surface of this floor and being` discharged throughtransverse sl'ots guarded;` by bailies. The. lint, b'eingelghter, fails to followF the,l curved floor closely enough4 to be Y discharged and is carried alongk by the air current-to-the desired delivery point'. As above described; the ai'rr for stripping the lint from the sawcylinderem tersl inv large proportion; through the overheadmoteereceiving3chamber and as' its-direction of fiowgis opposite to thatof motes centrifugally expelled into the mote-receivingvcharnber; the eiciency of overhead motingjisdiminis'lied,` sincemany-ofV the motes are returned'bythe air cur-rentfand-picked-up-againby the saw teeth.

Tthe: present. inventionhasfor one-of its` objectstheaimprovementrofioverheadmeting, inparticularf byreducing theft-flow of; airA from; the L overhead f mote-.receiving'chamher towardlthev` saw cylinder, but'wthoutilessening the quantityon velot-zitylfzof"air available fore strippingrlint from thecsawv orfor.- conveying.l the, useful lint away, A further; object, is, to.=pr,o vide` `forrthe, admission, ofi air tofthefsawgv cylinder at, such a p oint, that. it, will not, opposefthe-cene trifugal `expulsion ofv heavy mcttesinto.` an overhead,mot,- inglchambe'r. to the rear of the saw cylinder, A further o bject Lis to provide for. thecontrolled ow of air towardA the saw` cylinder but without' establishing ao Current, `of, appreciablevolume, moving oppositely tothe directionof. the centrfugallyl ejected,k motes.y A further objechisrto, providefortheadinission of: air totheesaw cylinder. be,-` tweenjhe point. at which ,moteslare,centrifugally, expelledi into an" overhead mote-receiving chamber but above the ICC 2.. point" at' which thez useful lintisapneumatica'lly,stripped from., the ,sawf cylinder; into vthe.: discharge throat. A1 fura therfobject is tofprovid'e azlinterfgirr ofisimpleiandidurafble construction; which deliversplintgofz' azhighergcellulosexcone tent thanfginsmustomarilyf in use:l @their` and. further obs jects and-1l advantages ofthe invention will be :pointedioutt in`v the following more detailed description, andi-bye ref erence to; the; accompanying.drawinggwhiclrisf a; diagramal matic, frontfto-rear.. verticale section= througha. linten' gin embodying; the present invention; i

Referring; to the drawing, Athefnumeral 1 ,designatesoneg 015Y the uprighttmembers, of,v the grintramee the-frame:and` the casing of the gin being in; general of; conventional! form,l and.- construction,-I thevfframe, including;` suitablev transverse.- members1 suchK as;the, parts 2,., 3;I 4r, 5 65,1, ,8; etc which extend`4 from* one end l wall tofthe, othenof-,the gin, some. of. which, constitute supportslforthe operative. elements of the gin. The casing-of` the Vgim, asfhere. illusjg trated, comprises. thefoor. 1.0, `the top panelll, the: rear wallk 12 and end, panelsf at the. rightv and. left-hand ends oif` thee gin,. allen generallyy conventional construction, ,the casing being; airftight.except. for such, ports orA openings, as.. are intended to` admit inward flowT ofair, the..inter-ior of. the. casingbeingn maintained .att ar subatmospheric pres;i sure, as; is usual inf brushless, suction-.typel gins.. ofA this.y type, l

Atthefrward part of4 the gin there isprovided arolL 50x14 Within which isarranged. the iloat r.oll1 15 .whieh:-

presentsA thel roll Aofj'seed cotton ',tcbthegrate-fallk 16.,.whose.-I

b'arssare, supportedfahtheir uppen endseby. the transverse member.v 17" and which `at, their lower, ends, are supported b'y the seed'board 18.' The shaft 19fof'thersaw cylinder;-

i'sarrangedbelw the g-'rateffall' andcarries the. .saws conf stituting the saw-cylinder whose peripheralsurface is iik. dicated by they numerall 20,l itbeing understood' thatthe, diameter ofthe saw cylinder willfvary from time totiine as the, saws are worn down andf,sharpened.l

Tothe rear ofthesaw cylinder andwit'h'intle casingi there isg-located the overheadgmoting chamber` 21'hayingj tlieflbor-ZZ which, as here illustrated; is al thin panellvfr example; ofsheet'metal;` having its upper, frwardled'ge. 23" located closely-adjacent' to the periphery of'fthersaw cylinderv and, asherelshowmin a horizontalplane whichv is spaced'asubstantiz'il'v distance Yabove the horizontaiplane of the' aX-i'sofithe' saw'cylinden, This floor' 22 extends rearwardlyand downwardly, terminating atthe edge 27 whiclisi's spaced fromthe rearfwall 12' of'k the casingffr, a7 purposey hereinafter'descrilied; The moting chamber' oorf'ZZ ashere-illustrated; hasfstiifening'ilanges 25"at its-opposite endsy which' are disposed adjacent' to` the` in ner surfaces of-ithe opposite'v-endfpanels' oithe` gin'l casing; Asherel illustrated; the fl'ooriscpivotally'supportedat 241 totswing about ahorizontalaxis near its lower-rearendj` andi pin' andY slot;y adjustingf means- 26, of conventional type, islprovided whereby the uppery end offtheorfmay be adjustablyI movedup or down sothatitheedgeeZS'` mayrbe disposedcloselyadjacenty to #the periphery o`fthe= saw:cylinderfaccordng:to the varying diameter'- of the latter:

A suction pipeSleadsA fiomthe'rearfohthe giirunavw suitableesourceaofi low'. pressureafor example; ai yfam `lilower, the; rear; wall: of! the: ginr l'iavingJ-an openingy With= whiclif the lend off; this; pipe registers; InsiderI oft theginf casing there; is arrangedatpipe :281,1 coaxial withA the'VpipeiS-andf having:lealcetightnV connection'. with .the latter; thefpipel 285 extending.; forwardly, and being-joined; atzitsnforwardtendf to;alransverselylextendingtsheettmetal cylinder 29swhoseoppositefendsv are closed: and. disposed ,f adjacentato: thezopppsiteud-fpanels ofthe-,gin.casing: Alint deliveryrcirr: duit, 30, reachingE fromrone end,p anel,=to the'otherofrthef casing, enterssthenupperparteci, cylinder zfimtangentiah relation to the latter, this conduit 30 having upper and lower-I walls 31 and 32 which merge smoothly with the roof 33 and oor 34 of a moting space M below the saw cylinder. The concave oor 34 of this moting space M is provided with one or more transversely extending slots 36, each slot having a forwardly and upwardly inclined baffle 37. The moting space M merges with the lower end of a lint delivery throat 38 having the rear wall 39 and the forward wall 40, the latter inclining upwardly and forwardly and terminating closely adjacent to the grate-fall 16. The upper edge of the vertical rear wall 39 of the throat is closely adjacent to the periphery of the saw cylinder and is joined, as here shown, integrally with the lower edge of a curved guard 41 which is substantially concentric with the periphery of the saw cylinder and spaced a short distance from the latter, thereby providing a narrow passage between the guard and the periphery of the saw cylinder along which a current of air, entrained by the rotating saw cylinder, moves downwardly toward the throat 38. The throat structure and guard are desirably mounted for adjustment, as by means of a hinged support at H, to compensate for changes in the diameter'of the saw cylinder.

As here illustrated, the guard 41 terminates at the point 42 in a horizontal plane slightly above that of the axis of the saw cylinder, but spaced below the edge 23 of the oor 22, and from the point 42 an integral continuation of the guard, indicated at 43, extends downwardly and rearwardly with its rear edge portion 44 resting upon the outer surface of the cylinder 29. This mem i ber 43 constitutes a partition, forming the bottom wall of an air passage 45 whose upper wall is formed by the lower surface of the floor 22 and which is here shown as tapering in vertical dimensions toward its delivery end immediately above the upper edge 42 of the guard 41. Directly to the rear of the lower end of the oor 22 the rear wall 12 of the casing is provided with an air inlet aperture 47 which is here shown as provided with the adjustable closure member 48 which may be swung about its upper edge so as to vary the effective size of the aperture 47. This member 48 also constitutes a motedeecting guide, as hereafter described. In the lower, rear part of the casing there is provided a stationary downwardly and forwardly inclined deector 49 which terminates at the rear edge of a mote-discharge aperture 50 in the front of the casing and at the forward, lower part of the casing there is provided a stationary, downwardly and rearwardly inclined deector 51 whose lower edge coincides with the forward edge of the aperture 50.

In the drawing, the feathered arrows indicate the direction of movement of motes while the plain arrows illustrate the movement of air currents. It will be observed that motes are thrown off from the upper portion of the periphery of the saw cylinder into the overhead moting chamber 21 and travel downwardly in the direction of the feathered arrows, eventually dropping downwardly between the lower edge 27 of the moting chamber floor 22 and the deflector 48 and then falling downwardly past the pipe 28` and onto the deector 49 and thence out through the aperture 50. Any suitable means may be provided for collecting or conveying away the motes which fall .through the aperture 50. If desired, an adjustable door A may be provided, for admitting a regulated quantity of air to enter the space below the part 34.

l By reason of the low pressure maintained within the gin casing, aided by the entraining action of the saw cylinder, air enters the aperture 47 in the rear wall of the casing and follows the direction of the plain arrows, passing underneath the lioor 22 and eventually entering the space between the periphery of the saw cylinder and the guard 41 and, moving along with the saw cylinder, passes down into the throat 38, thence through the moting space M and into the cylinder 29, and thence outwardly through the pipes 28 and S. Fine motes,` dust vand hull-pepper, carried downwardly through the throat 4 l 38 with the air current into the space M, are swept out through the slots 36 and move downwardly and escape through the aperture 50. The useful lint, stripped from the saw cylinder by the air current into the throat 38 is swept along by the air current through the conduit 30 into the cylinder 29 and thence out through the pipes 28 and S.

It will be observed that the aperture 47 is of substantial size and thus air in considerable volume is able to enter at this point. The deector 48 assists in preventing this air from entering the overhead moting chamber 21, most of the air entering directly into the air passage 45. Any ne particles of lint which may have been thrown off into the overhead moting chamber 21 are caught by this air current as they pass downwardly between the lower end of the oor 27 and the deector 48 and are thus returned to the saw cylinder. On the other hand, since heavy motes thrown o into the chamber 21 do not meet any opposing air currents in said air chamber they do not return to the saw cylinder and being relatively heavy they drop downwardly through the air current entering at the aperture 47 without being diverted suciently to be picked up by the air current entering in the passage 4S.

The air in the overhead moting chamber 21 is substantially quiescent because sufficient air enters through the passage 45 to satisfy the entraining action of the saw cylinder and the suction effect within the gin casing and thus, as above noted, there are no appreciable air currents in the chamber 21 to oppose the centrifugal expulsion of motes into said chamber or of sufficient intensity to return motes toward the saw cylinder after they have been ejected from the latter.

Thus, with this simple construction, many of the diiculties inherent in the operation of customary types of gin have been overcome, the motes, hull-pepper, dust and other materials are more perfectly removed, and the resultant lint is cleaner and of a higher grade than that produced by usual gins so that the product brings a higher price and requires less subsequent cleaning than has been necessary when the lint is removed by ginning mechanisms of customary prior types.

While one desirable embodiment of the invention has herein been disclosed by way of example it is to be understood that the invention is broadly inclusive of any and all modifications falling within the scope of the appended claims.

I claim:

l. In a brushless, suction-type linter gin having a casing in which a subatmospheric pressure is maintained and which has an overhead moting chamber into which motes are delivered by a saw cylinder and wherein an imperforate guard, substantially concentric with the saw cylinder, eX- tends about the lower rear quadrant of the saw cylinder, the lower edge of the guard joining the upper edge of a member forming the rear wall of a downwardly directed delivery throat, a floor for the overhead moting chamber, the forward edge of the floor being adjacent to the periphery of the saw cylinder and the rear edge of the iloor being spaced from the rear wall of the casing thereby to provide an escape port from the overhead moting chamber through which solid particles expelled by the saw cylinder into the overhead moting chamber may drop into the j lower part of the casing, means dening an upwardly and forwardly inclined convergent passage, whose delivery end is between the forward edge of the iioor of the overhead moting chamber and the upper edge of the guard, through which air may approach the saw cylinder and enter the space between the latter and the guard without passing through the overhead moting chamber, and means whereby air at atmospheric pressure may enter the rear end of said passage, the escape port from the overhead moting chamber being so located, relatively to the entrance to said air passage, that useful lint which passes down through the escape port is entrained by the air entering said passage and delivered;.intothe space' between the saw cylinden and theguard.A

2 Ina brushless, suction-typeelinter` comprisingga casing 'havingl therein'anoverheadtmotingchamber,asaw cylinder which. deliversv motesinto said" o verheadQmQting chamber, means'within the casing-defining a delivery iconduit inv which subatmosph'eric pressure is maintained, means defining a delivery throat which extends downwardly from a point adjacent to the lower periphery of the saw cylinder and through which lint, stripped from the saw cylinder, is carried by an air current into the delivery conduit, the delivery throat having front and rear walls, an imperforate guard extending upwardly and rearwardly through substantially a quadrant of arc in substantially concentric relation to the saw cylinder from the rear wall of the delivery throat, in combination, a downwardly and rearwardly sloping floor for the overhead moting chamber whose forward edge is in close proximity to the periphery of the saw cylinder and in a horizontal plane above that of the axis of the saw cylinder, the floor being adjustable whereby its forward edge may be kept in close proximity to the periphery of the saw cylinder as the diameter of the saw cylinder changes during use, and an air-directing partition below the fioor of the overhead moting chamber, said partition sloping downwardly and rearwardly more steeply than the floor of the moting chamber and having its forward edge joined to the upper edge of said curved guard, the oor of the moting chamber and said partition defining an upwardly and forwardly convergent air passage through which air may approach the saw cylinder without passing through the overhead moting chamber, the rear edges of the floor and partition respectively being spaced forwardly from the rear wall of the casing and the casing having an aperture in its rear wall through which air may enter into the space between the rear edges of the floor and partition.

3. In a brushless suction-type linter gin of the kind having a casing wherein sub-atmospheric pressure is maintained and in which the lint is removed from the saw cylinder by suction means, the gin including a roll-box, grate-fall, and saw cylinder and having an overhead moting chamber to the rear of the saw cylinder, said moting chamber having a floor which inclines upwardly and forwardly and whose forward edge is closely adjacent to the periphery of the saw cylinder and spaced from the top wall of the casing to provide an entrance through which motes discharged from the saw may enter said moting chamber, an upwardly and forwardly inclined partition, below the floor of the moting chamber and cooperative with said oor to provide a forwardly and upwardly convergent air passage immediately below said floor and whose delivery end is close to the periphery of the saw cylinder, an imperforate curved shield extending downwardly and forwardly, in close adjacency to the periphery of the saw cylinder, from the forward edge of said inclined partition to a point below the saw cylinder, means defining a delivery throat whose rear wall extends down from the lower edge of said curved shield, means defining an educt passage, means defining a mote-separating space below the saw cylinder with which the throat merges and wherein sub-atmospheric pressure is maintained thereby creating an air current for sweeping the lint from the saws, said mote-separating space having a floor and a roof and communicating with a lint delivery conduit which has upper and lower walls, the upper surface of the floor of the mote-separating space comprising a concave portion which merges with the lower wall of the lint delivery conduit, means continuing the floor of the moting space substantially to the grate-fall, said floor having a narrow transversely extending delivery aperture through which motes are ejected, and a baffle blade extending upwardly and forwardly from the rear edge of said aperture, the casing having an aperture in its rear wall through which air may enter the rear end of said upwardly inclined air passage, the rear edge of the floor of the' overheadK motingfphamber beingwspacedfr'om wall of the casing andtbeing located' 'ab'ove saidaperturev thereby permitting, solid tparticles ,tordroptr fromtthe moting chamber, the rear `edge ofthe inclined partition also being spaced from the'rearwall'ofthe casingandbeing located helowsaidzapertute. whereby `solid particles, droppingfrom theA motingf;chamb er, must pass Ihrer-1gb; air enteringtsaid aperture on its way into the rear end of said inclined air passage.

4. In combination in a brushless linter gin of the kind wherein the lint is removed from the saw cylinder by suction, and wherein a casing houses a roll-box, a grate-fall, a saw cylinder, and means defining an overhead moting chamber to the rear of the saw cylinder and having a floor whose forward edge is closely adjacent to the periphery of the saw cylinder and in a horizontal plane above that of the axis of the saw cylinder and which defines the lower edge of an entrance to said moting chamber, and upwardly and forwardly inclined imperforate partition below the floor of the moting chamber and which is inclined more steeply to the horizontal than is the oor of the moting chamber thereby cooperating with the latter to provide an upwardly and forwardly convergent air passage whose delivery end is close to the periphery of the saw cylinder and immediately below the entrance to the overhead moting chamber, an impervious curved shield extending downwardly and forwardly, in close adjacency to the periphery of the saw cylinder, from the forward edge of said inclined partition to a point below the saw cylinder, means defining a delivery throat extending downwardly from the lower portion of the periphery of the saw cylinder, means defining a passage into which the delivery throat discharges, said passage having a wall comprising a curved portion and a straight portion, the curved portion being constructed and arranged to cause air, entering the passage from the delivery throat, to be deflected through an arc of approximately thereby creating centrifugal force which presses entrained dust and heavy particles against said wall, said wall having a transversely extending narrow delivery port through which motes carried by the air current sweeping along said wall are ejected, a baille blade extending upwardly and forwardly from the rear edge of said aperture, means providing a space through which motes and useful lint which enter the overhead moting chamber may fall freely, the aforesaid air passage extending from the forward part of said space, the casing having an aperture in its rear wall opening into the rear part of said space and through which air flows into and across said space into the entrance to said air passage, and adjustable means for varying the location of the upper edge of the aperture in the rear wall of the casing.

5. In combination, in a suction-type, brushless gin having a casing wherein sub-atmospheric pressure is maintained and which has top, rear and side walls, a saw cylinder and grate-fall within the casing, and means defining an overhead moting chamber within the casing into which motes and some useful lint are expelled by the saw cylinder, said moting chamber having a floor whose forward edge is closely adjacent to the periphery of the saw cylinder at a point above the horizontal plane of the axis of the saw cylinder and whose rear edge is spaced from the rear wall of the casing thereby to permit motes and useful lint which enter the moting chamber to fall freely from the rear edge of said floor, means defining an air passage immediately below the floor of said moting cham ber, said passage converging upwardly and forwardly from adjacent to the rear edge of said oor to the periphery of the saw cylinder and being operative to deliver a lintcarrying air current to the periphery of the saw cylinder at a point immediately below the forward edge of the floor of the moting chamber, the rear wall of the casing having an air inlet opening located adjacent to the rear end of said air passage, and means associated with said References Cited in the le of this patent UNITED STATES PATENTS Lumpkin et a1 Dec. 31, 1895 Fordyce June 4, 1912 8 West l May 7, 1918 Vardell Aug. 22, 1922 Grimes Mar. 10, 1942 Rieker Feb. 9, 1943 Blaylock May 11, 1943 Vandergriff .v. Mar. 11, 1952 Graebe Dec. 23, 1952 

